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I have experienced the same sort of problem. (Ender 3, marlin 1.19, BLtouch, Cura 3.6)

I have this stl. I sliced it with Cura 3.6, it looks good and made 1 print.

I get shifting layers.

I tried again, fixed the STL in FReeCad, sliced it with Cura 3.6. I get shifting layers exactly at the same layer and of the same exact amount of shift. The STL looks good when sliced in Cura 3.6.

Trying to see if it was the Y-axis, but shift at the exact same layer twice would be very strange for a slipping pully, I decided to just rotate the STL 90 degrees in Cura 3.6. Sliced STL looks good again. I print it, expecting layer shift in the Y-axis again at the same layers at the 2 attempts before but now.... it prints perfectly, no layer shifts, not in Y not in X.

I looked in the gcode and the layers co-ordinates for the shifting layers are the same, gcode looks good. Rotating the object 90 degrees and printing it is proof of that and I manually checked the gcode of the object.

I had this happen to another small object, shift were also in the Y-axis, solved that by choosing another object which was the same as the small object but a taller version, cant remember if I rotated that 90 degrees compared to the small object.

Kevig, if you contact me, we can share some information and try to solve this.

I attached the file that has shifting layers, but when rotated 90 degrees, shifting layers disappear.

- the problem occeurs often the layer before or after a change in design
(ie i had a keychain with cutout characters, the layer after the characters shifted or with a fanduct exactly at the end of a internal screw hole)

in the next couple of days, i am going to try different angles and cura 351

- the problem occeurs often the layer before or after a change in design
(ie i had a keychain with cutout characters, the layer after the characters shifted or with a fanduct exactly at the end of a internal screw hole)

You have a problem with your printer hardware, loose belt, loose pulley or something like that. Check the tension of your belts, check if the belt itself is ok. I am sure you have some play on one axle and due to a direction change, the layer will be slightly shifted a little bit.

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This is almost always a slipping pulley. Does your printer have belts? That go over pulleys? If so tighten the hell out of the set screws that keep the pulley from slipping on the shaft. Also mark the pulley and the shaft with a marker to see if it is moving after your next layer shift. Usually it's the pulley that is hardest to get to such as the one on the motor.

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and also it is virtually impossible to get a slipping pulley or belt to slip twice at exactly the same place, and exactly the same amount of shift and on top of that, no shifting besides that.

and if i rotate the same model 90 degrees, reslice and reprint no shifting occeurs at all

if it is a loose pulley/belt, it should shift randomly or the shift same amount every time the pulley is in the same position.

and it should do the same after rotating the model

when printing the keychains (as shown in the pictures) i tryed to simply reprint (turn of printer, turn it on again, load the model from SD card and start printing) and it shifted exactly at the same layer and the same amount

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Found it.
my Vref on the stepper-drivers was to low.
as a result the motor did not got enough power to move the printbed and skipped steps
(printbed is the heaviest part on my printer)
i increased the power from 0.72 to 8.7 and the problem dissapeared
the temp from the drivers rose from 55deg to 59deg
Henk

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